Contactor Bounce Detection With Dynamic Pull-In Coil Re-Energization
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Solution Overview
Problem
Contactors experience bouncing or chatter under high vibration conditions, leading to arcing and power transients, which existing vibration dampening methods are insufficient to mitigate reliably.
Innovation Solution
A contactor system that detects contact voltage fluctuations to temporarily re-energize the pull-in coil and increase the magnetic field to re-establish contact alignment, minimizing thermal damage and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull-in coil is continuously energized to maintain high magnetic field for contactor operation, then contactor reliability is improved, but power consumption and thermal energy increase excessively
Solution Approach 1:
The system uses periodic monitoring of contact voltage to detect bouncing events and triggers periodic re-energization of the pull-in coil only when needed. The controller alternates between holding coil-only operation (normal state) and temporary pull-in coil re-energization (correction state), creating a periodic action pattern that maintains reliability while minimizing power consumption.
Solution Approach 2:
The system employs self-service by automatically detecting contact bouncing through voltage monitoring and autonomously triggering pull-in coil re-energization without external intervention. The controller continuously monitors contact voltage and self-corrects bouncing events, eliminating the need for manual intervention or continuous high-power operation.
2Stability of the object's composition
If vibration dampening mounts are used to reduce contact bouncing, then contact stability is improved, but the mitigation is insufficient and unreliable under high vibration conditions
Solution Approach 1:
The system implements feedback by continuously monitoring contact voltage to detect bouncing events. The voltage monitor provides real-time feedback to the controller, which then triggers pull-in coil re-energization when bouncing is detected. This closed-loop feedback mechanism ensures reliable contact stability even under high vibration conditions where passive dampening fails.
3Use of energy by moving object
If the hold coil operates alone with lower magnetic field to reduce power consumption, then power efficiency is improved, but contact bouncing occurs under high vibration conditions
Solution Approach 1:
The system dynamically adjusts the magnetic field strength based on operating conditions. During normal operation, only the hold coil operates with lower magnetic field for power efficiency. When vibration-induced bouncing is detected, the system dynamically transitions to higher magnetic field operation by re-energizing the pull-in coil, then returns to low-power mode after correction. This dynamic adaptation resolves the contradiction between power efficiency and contact stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively stabilizes power delivery by reducing contact bouncing and arcing, while minimizing thermal energy and power consumption.
Implementation Method 1
The first coil, called the pull-in coil 102, creates a high magnetic field to rapidly close the contacts
Implementation Method 2
A contactor is essentially a switch that is actuated by powering an electromagnet, which in turn pulls a conductive bar across two contacts
Implementation Method 3
The second coil, called the hold coil 104, creates a lower magnetic field to keep or maintain the contacts in a closed state
Data Source
AI summary
The present invention detects contact bouncing in a contactor by measuring contact voltage fluctuations caused by the bouncing power delivery contacts controlled by the contactor. When these fluctuations are detected, a circuit causes a pull-in coil of the contactor to be temporarily re-energized to re-establish a higher magnetic field needed to pull and maintain the power delivery contacts into proper position, which eliminates the bouncing. Because of the high power required by the pull-in coil, the time that the pull-in coil is actuated is limited in order to avoid thermal damage to the coil or other electronic components. After the pull-in coil is activated to move the power delivery contacts into proper position, a lower magnetic field hold coil is instead energized to maintain the power delivery contacts in place. The time that the pull-in coil is activated is dynamic and correspond to each disturbance as the disturbance happens, or the time is a set time determined by a timer, or the time is controlled by a Pulse Width Modulation scheme.